SILICONE RUBBER COMPOSITION FOR SEALING OPTICAL SEMICONDUCTOR AND OPTICAL SEMICONDUCTOR APPARATUS

PROBLEM TO BE SOLVED: To obtain a silicone rubber composition for sealing an optical semiconductor, which provides a cured product having excellent strength to molding pressure in sealing with a molding resin and is suitable as a sealant for an optical semiconductor and to provide an optical semiconductor apparatus. SOLUTION: The silicone rubber composition for sealing an optical semiconductor comprises (A) a polyorganosiloxane containing ≥0.2 alkenyl group in one molecule on the average, (B) a polyorganohydrogensiloxane composed of (B1) a siloxane containing an SiH group in the middle of a molecular chain and (B2) a siloxane containing SiH groups at both molecular chain terminals, (C) a platinum-based catalyst in which the amount of the component (B) mixed is an amount to give the total of the SiH groups of the component (B) of 0.2-2.0 based on one alkenyl group of the component (A), the ratio of the SiH group of the component (B2) is 0.1-0.8 based on the total of the SiH groups of the component (B) and the amount of the SiH group of the component (B1) is 0.2-1.0 based on one alkenyl group of the component A and has hardness (type E) after curing of 5-50. COPYRIGHT: (C)2008,JPO&INPIT